diff --git a/Library/Homebrew/cask/lib/hbc.rb b/Library/Homebrew/cask/lib/hbc.rb
index 363879574d..4f22a643d8 100644
--- a/Library/Homebrew/cask/lib/hbc.rb
+++ b/Library/Homebrew/cask/lib/hbc.rb
@@ -7,7 +7,6 @@ require "hbc/auditor"
 require "hbc/cache"
 require "hbc/cask"
 require "hbc/cask_loader"
-require "hbc/without_source"
 require "hbc/caskroom"
 require "hbc/checkable"
 require "hbc/cli"
@@ -24,7 +23,6 @@ require "hbc/macos"
 require "hbc/pkg"
 require "hbc/qualified_token"
 require "hbc/scopes"
-require "hbc/source"
 require "hbc/staged"
 require "hbc/system_command"
 require "hbc/topological_hash"
@@ -45,10 +43,7 @@ module Hbc
     Caskroom.ensure_caskroom_exists
   end
 
-  def self.load(query)
-    odebug "Loading Cask definitions"
-    cask = Source.for_query(query).load
-    cask.dumpcask
-    cask
+  def self.load(ref)
+    CaskLoader.load(ref)
   end
 end
diff --git a/Library/Homebrew/cask/lib/hbc/cask_loader.rb b/Library/Homebrew/cask/lib/hbc/cask_loader.rb
index 3fe02d7e15..c392e6b727 100644
--- a/Library/Homebrew/cask/lib/hbc/cask_loader.rb
+++ b/Library/Homebrew/cask/lib/hbc/cask_loader.rb
@@ -1,44 +1,167 @@
 module Hbc
-  class CaskLoader
-    def self.load_from_file(path)
-      raise CaskError, "File '#{path}' does not exist"      unless path.exist?
-      raise CaskError, "File '#{path}' is not readable"     unless path.readable?
-      raise CaskError, "File '#{path}' is not a plain file" unless path.file?
-
-      token = path.basename(".rb").to_s
-      content = IO.read(path).force_encoding("UTF-8")
-
-      new(token, content, path).load
-    end
-
-    def self.load_from_string(token, content)
-      new(token, content).load
-    end
-
-    def load
-      instance_eval(@content, __FILE__, __LINE__)
-    rescue CaskError, StandardError, ScriptError => e
-      e.message.concat(" while loading '#{@token}'")
-      e.message.concat(" from '#{@path}'") unless @path.nil?
-      raise e, e.message
-    end
-
-    private
-
-    def initialize(token, content, path = nil)
-      @token = token
-      @content = content
-      @path = path unless path.nil?
-    end
-
-    def cask(header_token, &block)
-      raise CaskTokenDoesNotMatchError.new(@token, header_token) unless @token == header_token
-
-      if @path.nil?
-        Cask.new(@token, &block)
-      else
-        Cask.new(@token, sourcefile_path: @path, &block)
+  module CaskLoader
+    class FromContentLoader
+      def initialize(content)
+        @content = content
       end
+
+      def load
+        instance_eval(@content.force_encoding("UTF-8"), __FILE__, __LINE__)
+      end
+
+      private
+
+      def cask(header_token, &block)
+        Cask.new(header_token, &block)
+      end
+    end
+
+    class FromPathLoader < FromContentLoader
+      def self.can_load?(ref)
+        path = Pathname.new(ref)
+        path.extname == ".rb" && path.expand_path.exist?
+      end
+
+      attr_reader :token, :path
+
+      def initialize(path)
+        path = Pathname.new(path).expand_path
+
+        @token = path.basename(".rb").to_s
+        @path = path
+      end
+
+      def load
+        raise CaskError, "'#{@path}' does not exist."  unless @path.exist?
+        raise CaskError, "'#{@path}' is not readable." unless @path.readable?
+        raise CaskError, "'#{@path}' is not a file."   unless @path.file?
+
+        @content = IO.read(@path)
+
+        super
+      end
+
+      private
+
+      def cask(header_token, &block)
+        if @token != header_token
+          raise CaskTokenDoesNotMatchError.new(@token, header_token)
+        end
+
+        Cask.new(header_token, sourcefile_path: @path, &block)
+      end
+    end
+
+    class FromURILoader < FromPathLoader
+      def self.can_load?(ref)
+        !(ref.to_s !~ ::URI.regexp)
+      end
+
+      def initialize(url)
+        @url = url
+        uri = URI(url)
+        super Hbc.cache/File.basename(uri.path)
+      end
+
+      def load
+        Hbc.cache.mkpath
+        FileUtils.rm_f @path
+
+        begin
+          ohai "Downloading #{@url}."
+          curl @url, "-o", @path
+        rescue ErrorDuringExecution
+          raise CaskUnavailableError, @url
+        end
+
+        super
+      end
+    end
+
+    class FromTapLoader < FromPathLoader
+      def self.can_load?(ref)
+        !(ref.to_s !~ HOMEBREW_TAP_CASK_REGEX)
+      end
+
+      def initialize(tapped_name)
+        user, repo, token = tapped_name.split("/", 3).map(&:downcase)
+        @tap = Tap.fetch(user, repo)
+
+        super @tap.cask_dir/"#{token}.rb"
+      end
+
+      def load
+        @tap.install unless @tap.installed?
+
+        super
+      end
+    end
+
+    class NullLoader < FromPathLoader
+      def self.can_load?(*)
+        true
+      end
+
+      def initialize(ref)
+        @token = File.basename(ref, ".rb")
+        super CaskLoader.default_path(@token)
+      end
+
+      def load
+        raise CaskUnavailableError, @token
+      end
+    end
+
+    def self.load_from_file(path)
+      FromPathLoader.new(path).load
+    end
+
+    def self.load_from_string(content)
+      FromContentLoader.new(content).load
+    end
+
+    def self.path(ref)
+      self.for(ref).path
+    end
+
+    def self.load(ref)
+      self.for(ref).load
+    end
+
+    def self.for(ref)
+      [
+        FromURILoader,
+        FromTapLoader,
+        FromPathLoader,
+      ].each do |loader_class|
+        return loader_class.new(ref) if loader_class.can_load?(ref)
+      end
+
+      if FromPathLoader.can_load?(default_path(ref))
+        return FromPathLoader.new(default_path(ref))
+      end
+
+      possible_tap_casks = tap_paths(ref)
+      if possible_tap_casks.count == 1
+        possible_tap_cask = possible_tap_casks.first
+        return FromPathLoader.new(possible_tap_cask)
+      end
+
+      possible_installed_cask = Cask.new(ref)
+      if possible_installed_cask.installed?
+        return FromPathLoader.new(possible_installed_cask.installed_caskfile)
+      end
+
+      NullLoader.new(ref)
+    end
+
+    def self.default_path(token)
+      Hbc.default_tap.cask_dir/"#{token.to_s.downcase}.rb"
+    end
+
+    def self.tap_paths(token)
+      Tap.map { |t| t.cask_dir/"#{token.to_s.downcase}.rb" }
+         .select(&:exist?)
     end
   end
 end
diff --git a/Library/Homebrew/cask/lib/hbc/locations.rb b/Library/Homebrew/cask/lib/hbc/locations.rb
index 80add91dd5..c15cec32bf 100644
--- a/Library/Homebrew/cask/lib/hbc/locations.rb
+++ b/Library/Homebrew/cask/lib/hbc/locations.rb
@@ -126,15 +126,14 @@ module Hbc
         end
 
         if token_with_tap
-          user, repo, token = token_with_tap.split("/")
+          user, repo, token = token_with_tap.split("/", 3)
           tap = Tap.fetch(user, repo)
         else
           token = query_without_extension
           tap = Hbc.default_tap
         end
 
-        return query_path if tap.cask_dir.nil?
-        tap.cask_dir.join("#{token}.rb")
+        CaskLoader.default_path(token)
       end
 
       def tcc_db
diff --git a/Library/Homebrew/cask/lib/hbc/scopes.rb b/Library/Homebrew/cask/lib/hbc/scopes.rb
index aa870eec55..fb26757358 100644
--- a/Library/Homebrew/cask/lib/hbc/scopes.rb
+++ b/Library/Homebrew/cask/lib/hbc/scopes.rb
@@ -11,15 +11,15 @@ module Hbc
       end
 
       def all_tapped_cask_dirs
-        Tap.map(&:cask_dir).compact
+        Tap.map(&:cask_dir).select(&:directory?)
       end
 
       def all_tokens
-        Tap.map do |t|
+        Tap.flat_map do |t|
           t.cask_files.map do |p|
             "#{t.name}/#{File.basename(p, ".rb")}"
           end
-        end.flatten
+        end
       end
 
       def installed
diff --git a/Library/Homebrew/cask/lib/hbc/source.rb b/Library/Homebrew/cask/lib/hbc/source.rb
deleted file mode 100644
index 5f2e9ddfef..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source.rb
+++ /dev/null
@@ -1,37 +0,0 @@
-require "hbc/source/gone"
-require "hbc/source/path_slash_required"
-require "hbc/source/path_slash_optional"
-require "hbc/source/tapped_qualified"
-require "hbc/source/untapped_qualified"
-require "hbc/source/tapped"
-require "hbc/source/uri"
-
-module Hbc
-  module Source
-    def self.sources
-      [
-        URI,
-        PathSlashRequired,
-        TappedQualified,
-        UntappedQualified,
-        Tapped,
-        PathSlashOptional,
-        Gone,
-      ]
-    end
-
-    def self.for_query(query)
-      odebug "Translating '#{query}' into a valid Cask source"
-      raise CaskUnavailableError, query if query.to_s =~ /^\s*$/
-      source = sources.find do |s|
-        odebug "Testing source class #{s}"
-        s.me?(query)
-      end
-      raise CaskUnavailableError, query unless source
-      odebug "Success! Using source class #{source}"
-      resolved_cask_source = source.new(query)
-      odebug "Resolved Cask URI or file source to '#{resolved_cask_source}'"
-      resolved_cask_source
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/gone.rb b/Library/Homebrew/cask/lib/hbc/source/gone.rb
deleted file mode 100644
index 1c744d0dbb..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/gone.rb
+++ /dev/null
@@ -1,23 +0,0 @@
-module Hbc
-  module Source
-    class Gone
-      def self.me?(query)
-        WithoutSource.new(query).installed?
-      end
-
-      attr_reader :query
-
-      def initialize(query)
-        @query = query
-      end
-
-      def load
-        WithoutSource.new(query)
-      end
-
-      def to_s
-        ""
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/path_base.rb b/Library/Homebrew/cask/lib/hbc/source/path_base.rb
deleted file mode 100644
index 4e4bdcf158..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/path_base.rb
+++ /dev/null
@@ -1,29 +0,0 @@
-require "rubygems"
-require "hbc/cask_loader"
-
-module Hbc
-  module Source
-    class PathBase
-      # derived classes must define method self.me?
-
-      def self.path_for_query(query)
-        Pathname.new(query).sub(/(\.rb)?$/, ".rb")
-      end
-
-      attr_reader :path
-
-      def initialize(path)
-        @path = Pathname.new(path).expand_path
-      end
-
-      def load
-        CaskLoader.load_from_file(@path)
-      end
-
-      def to_s
-        # stringify to fully-resolved location
-        @path.to_s
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/path_slash_optional.rb b/Library/Homebrew/cask/lib/hbc/source/path_slash_optional.rb
deleted file mode 100644
index d96a41130d..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/path_slash_optional.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-require "hbc/source/path_base"
-
-module Hbc
-  module Source
-    class PathSlashOptional < PathBase
-      def self.me?(query)
-        path = path_for_query(query)
-        path.exist?
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/path_slash_required.rb b/Library/Homebrew/cask/lib/hbc/source/path_slash_required.rb
deleted file mode 100644
index 2753b17109..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/path_slash_required.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-require "hbc/source/path_base"
-
-module Hbc
-  module Source
-    class PathSlashRequired < PathBase
-      def self.me?(query)
-        path = path_for_query(query)
-        path.to_s.include?("/") && path.exist?
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/tapped.rb b/Library/Homebrew/cask/lib/hbc/source/tapped.rb
deleted file mode 100644
index c1f5f95bca..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/tapped.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-module Hbc
-  module Source
-    class Tapped
-      def self.me?(query)
-        Hbc.path(query).exist?
-      end
-
-      attr_reader :token
-
-      def initialize(token)
-        @token = token
-      end
-
-      def load
-        PathSlashOptional.new(Hbc.path(token)).load
-      end
-
-      def to_s
-        # stringify to fully-resolved location
-        Hbc.path(token).expand_path.to_s
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/tapped_qualified.rb b/Library/Homebrew/cask/lib/hbc/source/tapped_qualified.rb
deleted file mode 100644
index 2db6ddbca5..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/tapped_qualified.rb
+++ /dev/null
@@ -1,21 +0,0 @@
-require "hbc/source/tapped"
-
-module Hbc
-  module Source
-    class TappedQualified < Tapped
-      def self.me?(query)
-        return if (tap = tap_for_query(query)).nil?
-
-        tap.installed? && Hbc.path(query).exist?
-      end
-
-      def self.tap_for_query(query)
-        qualified_token = QualifiedToken.parse(query)
-        return if qualified_token.nil?
-
-        user, repo = qualified_token[0..1]
-        Tap.fetch(user, repo)
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/untapped_qualified.rb b/Library/Homebrew/cask/lib/hbc/source/untapped_qualified.rb
deleted file mode 100644
index 698cc46ce6..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/untapped_qualified.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-require "hbc/source/tapped_qualified"
-
-module Hbc
-  module Source
-    class UntappedQualified < TappedQualified
-      def self.me?(query)
-        return if (tap = tap_for_query(query)).nil?
-
-        tap.install
-        tap.installed? && Hbc.path(query).exist?
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/source/uri.rb b/Library/Homebrew/cask/lib/hbc/source/uri.rb
deleted file mode 100644
index 09fab4bd0e..0000000000
--- a/Library/Homebrew/cask/lib/hbc/source/uri.rb
+++ /dev/null
@@ -1,32 +0,0 @@
-module Hbc
-  module Source
-    class URI
-      def self.me?(query)
-        !(query.to_s =~ ::URI.regexp).nil?
-      end
-
-      attr_reader :uri
-
-      def initialize(uri)
-        @uri = uri
-      end
-
-      def load
-        Hbc.cache.mkpath
-        path = Hbc.cache.join(File.basename(uri))
-        ohai "Downloading #{uri}"
-        odebug "Download target -> #{path}"
-        begin
-          curl(uri, "-o", path.to_s)
-        rescue ErrorDuringExecution
-          raise CaskUnavailableError, uri
-        end
-        PathSlashOptional.new(path).load
-      end
-
-      def to_s
-        uri.to_s
-      end
-    end
-  end
-end
diff --git a/Library/Homebrew/cask/lib/hbc/without_source.rb b/Library/Homebrew/cask/lib/hbc/without_source.rb
deleted file mode 100644
index 69131d5c70..0000000000
--- a/Library/Homebrew/cask/lib/hbc/without_source.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-module Hbc
-  class WithoutSource < Cask
-    # Override from `Hbc::DSL` because we don't have a cask source file to work
-    # with, so we don't know the cask's `version`.
-    def staged_path
-      (caskroom_path.children - [metadata_master_container_path]).first
-    end
-
-    def to_s
-      "#{token} (!)"
-    end
-
-    def installed?
-      caskroom_path.exist?
-    end
-  end
-end
diff --git a/Library/Homebrew/cmd/irb.rb b/Library/Homebrew/cmd/irb.rb
index 5561845e72..cba8a5b82b 100644
--- a/Library/Homebrew/cmd/irb.rb
+++ b/Library/Homebrew/cmd/irb.rb
@@ -19,6 +19,11 @@ class String
   end
 end
 
+def cask
+  $LOAD_PATH.unshift("#{HOMEBREW_LIBRARY_PATH}/cask/lib")
+  require "hbc"
+end
+
 module Homebrew
   module_function
 
diff --git a/Library/Homebrew/compat/hbc/cask_loader.rb b/Library/Homebrew/compat/hbc/cask_loader.rb
index a7c84e3ce8..e6cb65b4f2 100644
--- a/Library/Homebrew/compat/hbc/cask_loader.rb
+++ b/Library/Homebrew/compat/hbc/cask_loader.rb
@@ -12,7 +12,11 @@ module CaskLoaderCompatibilityLayer
 end
 
 module Hbc
-  class CaskLoader
-    prepend CaskLoaderCompatibilityLayer
+  module CaskLoader
+    class FromContentLoader; end
+
+    class FromPathLoader < FromContentLoader
+      prepend CaskLoaderCompatibilityLayer
+    end
   end
 end
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 56e06834d9..ba55e3cf66 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -285,7 +285,7 @@ class Tap
 
   # path to the directory of all {Formula} files for this {Tap}.
   def formula_dir
-    @formula_dir ||= potential_formula_dirs.detect(&:directory?)
+    @formula_dir ||= potential_formula_dirs.detect(&:directory?) || path/"Formula"
   end
 
   def potential_formula_dirs
@@ -294,12 +294,12 @@ class Tap
 
   # path to the directory of all {Cask} files for this {Tap}.
   def cask_dir
-    @cask_dir ||= [path/"Casks"].detect(&:directory?)
+    @cask_dir ||= path/"Casks"
   end
 
   # an array of all {Formula} files of this {Tap}.
   def formula_files
-    @formula_files ||= if formula_dir
+    @formula_files ||= if formula_dir.directory?
       formula_dir.children.select(&method(:formula_file?))
     else
       []
@@ -308,7 +308,7 @@ class Tap
 
   # an array of all {Cask} files of this {Tap}.
   def cask_files
-    @cask_files ||= if cask_dir
+    @cask_files ||= if cask_dir.directory?
       cask_dir.children.select(&method(:cask_file?))
     else
       []
diff --git a/Library/Homebrew/test/cask/cli/list_spec.rb b/Library/Homebrew/test/cask/cli/list_spec.rb
index e367e95887..b53eb169ac 100644
--- a/Library/Homebrew/test/cask/cli/list_spec.rb
+++ b/Library/Homebrew/test/cask/cli/list_spec.rb
@@ -40,23 +40,6 @@ describe Hbc::CLI::List, :cask do
     end
   end
 
-  describe "when Casks have been renamed" do
-    let(:caskroom_path) { Hbc.caskroom.join("ive-been-renamed") }
-    let(:staged_path) { caskroom_path.join("latest") }
-
-    before do
-      staged_path.mkpath
-    end
-
-    it "lists installed Casks without backing ruby files (due to renames or otherwise)" do
-      expect {
-        Hbc::CLI::List.run
-      }.to output(<<-EOS.undent).to_stdout
-        ive-been-renamed (!)
-      EOS
-    end
-  end
-
   describe "given a set of installed Casks" do
     let(:caffeine) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/local-caffeine.rb") }
     let(:transmission) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/local-transmission.rb") }